KHP won't install on my new PC

[Harmonee]

I have the install for KHP 4.103 (I have backed up all my downloaded installations). I have my unlock key for this version. When I try to install it, it will not complete because it says I installed this on another PC. I built myself a new PC and my husband is using my old one. I had 4.103 running on this new PC but when my hard drive crashed recently and I had to format and reinstall everything, it now will only let me install up to 4.008. I really miss the nice features of 4.103. Can you help please?